Villa boss always confident over Agbonlahor, Young

"I'm not saying every single person who is small and understrength always gets bigger and stronger, but there are people who can develop late and who have a better chance to develop now than they would have done 20 or 30 years ago," O'Neill said. "If you've got the desire, the ability and the will to put the hard work in to achieve something, the rest shouldn't be a problem."